ethmoidal foramina, fora´mina ethmoida´lia small openings in the ethmoid bone at the junction of the medial wall with the roof of the orbit, the anterior transmitting the nasal branch of the ophthalmic nerve and the anterior ethmoid vessels, the posterior transmitting the posterior ethmoid vessels.

incisive foramen one of the openings of the incisive canals into the incisive fossa of the hard palate.

interventricular foramen a passage from the third to the lateral ventricle of the brain.

intervertebral foramen a passage for a spinal nerve and vessels formed by notches on the pedicles of adjacent vertebrae.

jugular foramen an opening formed by the jugular notches of the temporal and occipital bones.

foramen mag´num a large opening in the anterior inferior part of the occipital bone, between the cranial cavity and spinal canal.

mastoid foramen an opening in the temporal bone behind the mastoid process.

in·ter·ven·tric·u·lar fo·ra·men

[TA]

the short, often slitlike passage that, on both the left and right side, connects the third brain ventricle (of the diencephalon) with the lateral ventricles (of the cerebral hemispheres); the passage is bounded anteriomedially by the column of fornix and posterolaterally by the anterior pole and anterior tubercle of the dorsal thalamus.

in·ter·ven·tric·u·lar for·a·men

(in'tĕr-ven-trik'yū-lăr fōr-ā'mĕn) [TA]

The short, often slitlike passage that, on both the left and right sides, connects the third brain ventricle (of the diencephalon) with the lateral ventricles (of the cerebral hemispheres); the passage is bounded anteriomedially by the column of fornix and posterolaterally by the anterior pole of the thalamus. Synonym(s): Monro foramen, porta (2) .

interventricular foramen

Monro,

Alexander, Jr., Scottish anatomist, 1733-1817.

Monro doctrine - states that the cranial cavity is a closed box and that a change in the quantity of intracranial blood can occur only through the displacement of or replacement by cerebrospinal fluid. Synonym(s): Monro-Kellie doctrine

Monro foramen - the short passage that connects the third ventricle of the diencephalon with the lateral ventricles of the cerebral hemispheres. Synonym(s): interventricular foramen

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